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Case Study: FGD Coatings In Coal Fired Power Plant

Michigan Coal Fired Power Plant
The FGD system is a 65 MW coal-fired power plant. It is equipped with an electrostatic precipitator and a wet flue gas desulfurizer (FGD) system for emission controls. The plant consumes approximately 550 tons of coal per day.

   

Project Description:

The two wet scrubbers were designed and built 30-40 years ago. The FGD system is a 65 MW coal-fired power plant. It is equipped with an electrostatic precipitator and a wet flue gas desulfurization (FGD) system for emission controls. The plant consumes approximately 550 tons of coal per day.

The alloy construction of reheat tubes was being attacked by the flue gas after wet scrubbing. The apparent problem is that the coal being burned is high in chlorides- 0.03% by weight resulting in a huge spike (10X) in slurry chlorides around 12000 ppm. The 316 L outlet reheater tubing is showing pitting from chlorides in the flue gas. Internal water temp is 200F in the tubes with external flue gas at 180 F. Steam at 600 F is sparged into the scrubber column below the reheater tubes at scheduled intervals

These conditions are similar to conditions experienced in the Jet Bubble Reactors, scrubbers and ductwork made of alloy that are being attacked by high chloride coal burning.

Tubes were coated from above and below with specialized spray equipment using ChemLINE 784-32 Gray Top Coat. After Scrubber #1 was coated, the client decided to immediately to line the reheat tubes in Scrubber #2.

The client was satisfied that the stainless tubes were lined within budget and will extend the life expectancy of the tubes. No significant heat transfer loss has been detected and the scrubber is working at peak performance.

ChemLINE from APC has proved that under the most challenging environments of heat, corrosion and wear, the ChemLINE polymer will provide long term solutions to coal burning with chloride contamination of the flue gas. We welcome discussions from other clients that find that their alloy construction has had similar corrosive conditions.

Because the ChemLINE linings have a higher cross link density, ChemLINE will out perform all other polymer formulas and provide
  • Superior corrosion resistance performance to over 5,000 chemical reagents
  • Resists 98% of all corrosive acids, alkalis, solvents, gasses and various temperatures
  • Aggressive Chemical Exposures
  • High wear and abrasion resistance
  • High Heat resistance to 500F
  • Flexible film - Impact resistant
  • Repairable lining
  • Superior corrosion performance verse stainless steel, baked phenolic, epoxy
    and vinyl ester
  • Not effected by chlorides like stainless steel
  • 40X smoother than epoxy / 4X smoother than stainless steel
  • Non Permeable won't absorb or contaminate making it an idea food
    contact lining
  • Thermal shock resistant: - 40F to 400F

A revolutionary lining for the Flue Gas Desulphurization Process.
  • ChemLINE is specially formulated polymer resin for handling the high temperature and abrasion requirements of FGD systems.
  • ChemLINE is a cross-linked organic-inorganic multifunctional polymer coating that exhibits high flexibility and toughness
  • ChemLINE LE temperature resistance (500°F/260°C)
  • Superior resistance to Acids, alkalis, solvents, oxidizing agents
  • Thermal shock -40°F (-40°C) to +500°F (+260°C)
  • Flex stressing
  • Wear and abrasion
  • Impact resistant

For more information please contact:

Paul Turner

Tel: 586-792-3325
Fax: 586-792-2711

Email: info@chemicalcontainment.com

 

Solution Driven.

Please contact us for more information on how we may provide solutions.